Support default constructors in analyzer2dart.

pkg/analyzer2dart/lib/src/converted_world.dart

 // Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 library analyzer2dart.convertedWorld;
 
 import 'dart:collection';
 
 import 'package:analyzer/analyzer.dart';
 import 'package:compiler/src/dart_types.dart' as dart2js;
@@ skipping 13 matching lines @@
   Iterable<dart2js.ClassElement> get instantiatedClasses;
   dart2js.FunctionElement get mainFunction;
   ir.Node getIr(dart2js.Element element);
   dart2js.DartTypes get dartTypes;
 }
 
 class _ConvertedWorldImpl implements ConvertedWorld {
   final dart2js.FunctionElement mainFunction;
   Map<dart2js.AstElement, ir.Node> executableElements =
       new HashMap<dart2js.AstElement, ir.Node>();
+  final List<dart2js.ClassElement> instantiatedClasses =
+      <dart2js.ClassElement>[];
 
   _ConvertedWorldImpl(this.mainFunction);
 
   // TODO(johnniwinther): Add all used libraries and all SDK libraries to the
   // set of libraries in the converted world.
   Iterable<dart2js.LibraryElement> get libraries => [mainFunction.library];
 
   Iterable<dart2js.AstElement> get resolvedElements => executableElements.keys;
 
-  Iterable<dart2js.ClassElement> get instantiatedClasses => [];
-
   ir.Node getIr(dart2js.Element element) => executableElements[element];
 
   final dart2js.DartTypes dartTypes = new _DartTypes();
 }
 
 ConvertedWorld convertWorld(ClosedWorld closedWorld) {
   ElementConverter converter = new ElementConverter();
   _ConvertedWorldImpl convertedWorld = new _ConvertedWorldImpl(
       converter.convertElement(closedWorld.mainFunction));
 
   void convert(analyzer.Element analyzerElement, AstNode node) {
     // Skip conversion of SDK sources since we don't generate code for it
     // anyway.
     if (analyzerElement.source.isInSystemLibrary) return;
 
     dart2js.AstElement dart2jsElement =
         converter.convertElement(analyzerElement);
     CpsElementVisitor visitor = new CpsElementVisitor(converter, node);
     ir.Node cpsNode = analyzerElement.accept(visitor);
-    if (cpsNode != null) {
-      convertedWorld.executableElements[dart2jsElement] = cpsNode;
-    } else {
+    convertedWorld.executableElements[dart2jsElement] = cpsNode;
+    if (cpsNode == null && !analyzerElement.isSynthetic) {
       String message =
          'No CPS node generated for $analyzerElement (${node.runtimeType}).';
       reportSourceMessage(analyzerElement.source, node, message);
       throw new UnimplementedError(message);
     }
   }
 
+  void convertClass(analyzer.ClassElement analyzerElement, _) {
+    // Skip conversion of SDK sources since we don't generate code for it
+    // anyway.
+    if (analyzerElement.source.isInSystemLibrary) return;
+    convertedWorld.instantiatedClasses.add(
+        converter.convertElement(analyzerElement));
+  }
+
   closedWorld.executableElements.forEach(convert);
   closedWorld.variables.forEach(convert);
   closedWorld.fields.forEach(convert);
+  closedWorld.instantiatedClasses.forEach(convertClass);
 
   return convertedWorld;
 }
 
 // TODO(johnniwinther): Implement [coreTypes] using [TypeProvider].
 class _DartTypes implements dart2js.DartTypes {
   @override
   get coreTypes => throw new UnsupportedError("coreTypes");
 
   @override
   bool isSubtype(dart2js.DartType t, dart2js.DartType s) {
     throw new UnsupportedError("isSubtype");
   }
 }